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1. A control device for being used with a treatment tool including an end effector configured to apply a treatment energy to a living tissue for treatment of the living tissue, the control device comprising: a processor configured to: execute a sealing control mode in which electrical power to seal the living tissue by heating the living tissue at a first temperature is supplied to the end effector, and an incision control mode in which electrical power to incise the living tissue by heating the living tissue at a second temperature that is higher than the first temperature is supplied to the end effector; calculate elapsed time as a first index value for a temperature of the end effector, the elapsed time beginning at a time when the end effector reaches the second temperature; calculate an impedance level at a treatment target of the living tissue; determine a change in the impedance level between the calculated impedance level and an initial impedance; compare the change in the impedance level to a predetermined residual heat-determination threshold impedance level to obtain a first comparison result; compare the first index value and a first threshold value to obtain a second comparison result; determine a residual heat level of the end effector based on the first comparison result and the second comparison result such that a low residual heat is determined when the change in the impedance level is less than the predetermined residual heat-determination threshold impedance level and a high residual heat is determined when the change in the impedance level is equal to or higher than the predetermined residual heat-determination threshold impedance level; and perform, based on the determined residual heat level, at least one of the following: issuance of a warning from a notifying unit; or adjustment of electrical power supplied to the end effector.
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